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Employee benefit plans (Tables)
12 Months Ended
Mar. 31, 2016
Employee benefit plans  
Net periodic benefit cost for defined benefit plans
     Millions of yen  
     Year ended March 31  
     2014     2015     2016  

Service cost

   ¥ 8,438      ¥ 7,800      ¥ 8,253   

Interest cost

     3,441        3,090        2,092   

Expected return on plan assets

     (4,971     (5,732     (6,064

Amortization of net actuarial losses

     2,767        2,127        1,456   

Amortization of prior service cost

     (1,149     (1,148     (1,148
  

 

 

   

 

 

   

 

 

 

Net periodic benefit cost

   ¥ 8,526      ¥ 6,137      ¥ 4,589   
  

 

 

   

 

 

   

 

 

 
Reconciliation of changes in projected benefit obligation and fair value of plan assets
     Millions of yen  
     As of or for the year ended March 31  
                 2015                              2016               

Change in projected benefit obligation:

    

Projected benefit obligation at beginning of year

   ¥ 233,885      ¥ 240,858   

Service cost

     7,800        8,253   

Interest cost

     3,090        2,092   

Actuarial gain

     6,106        13,121   

Benefits paid

     (10,070     (10,528

Acquisition, divestitures and other

     47        (504
  

 

 

   

 

 

 

Projected benefit obligation at end of year

   ¥ 240,858      ¥ 253,292   
  

 

 

   

 

 

 

Change in plan assets:

    

Fair value of plan assets at beginning of year

   ¥ 220,873      ¥ 233,837   

Actual return on plan assets

     15,660        2,540   

Employer contributions

     5,914        4,559   

Benefits paid

     (8,610     (8,909
  

 

 

   

 

 

 

Fair value of plan assets at end of year

   ¥ 233,837      ¥ 232,027   
  

 

 

   

 

 

 

Funded status at end of year

     (7,021     (21,265
  

 

 

   

 

 

 

Amounts recognized in the consolidated balance sheets

   ¥ (7,021   ¥ (21,265
  

 

 

   

 

 

 
Projected benefit obligation, accumulated benefit obligation and fair value of plan assets for pension plans with ABO and PBO in excess of plan assets
     Millions of yen  
     March 31  
     2015      2016  

Plans with ABO in excess of plan assets:

     

PBO

   ¥ 29,643       ¥ 31,788   

ABO

     29,643         31,788   

Fair value of plan assets

     —           —     

Plans with PBO in excess of plan assets:

     

PBO

   ¥ 29,643       ¥ 31,788   

ABO

     29,643         31,788   

Fair value of plan assets

     —           —     

 

Amounts in accumulated other comprehensive income, pre-tax, that have not yet been recognized as components of net periodic benefit cost
     Millions of yen  
     For the year  ended
March 31, 2016
 

Net actuarial loss

   ¥ 56,688   

Net prior service cost

     (8,236
  

 

 

 

Total

   ¥ 48,452   
  

 

 

 
Amounts in accumulated other comprehensive income, pre-tax, expected to be recognized as components of net periodic benefit cost over next fiscal year
     Millions of yen  
     For the year  ending
March 31, 2017
 

Net actuarial loss

   ¥ 2,848   

Net prior service cost

     (1,148
  

 

 

 

Total

   ¥ 1,700   
  

 

 

 
Schedule of weighted-average assumptions used to determine PBO
     March 31  
     2015     2016  

Discount rate

     0.9     0.6

Rate of increase in compensation levels

     2.5     2.5
Weighted-average assumptions used to determine net periodic benefit costs
     Year ended March 31  
     2014     2015     2016  

Discount rate

     1.4     1.4     0.9

Rate of increase in compensation levels

     2.5     2.5     2.5

Expected long-term rate of return on plan assets

     2.6     2.6     2.6
Information about plan assets at fair value
     Millions of yen  
     March 31, 2015  
     Level 1      Level 2      Level 3      Balance as  of
March 31, 2015
 

Pension plan assets:

           

Equities

   ¥ 23,665       ¥ —         ¥ —         ¥ 23,665   

Private equity investments

     —           —           6,793         6,793   

Japanese government securities

     67,066         —           —           67,066   

Bank and corporate debt securities

     2,183         2,502         —           4,685   

Investment trust funds and other(1)

     —           18,457         48,545         67,002   

Life insurance company general accounts

     —           48,989         —           48,989   

Other assets

     —           15,637         —           15,637   
  

 

 

    

 

 

    

 

 

    

 

 

 

Total

   ¥ 92,914       ¥ 85,585       ¥ 55,338       ¥ 233,837   
  

 

 

    

 

 

    

 

 

    

 

 

 

 

     Millions of yen  
     March 31, 2016  
     Level 1      Level 2      Level 3      Balance as  of
March 31, 2016
 

Pension plan assets:

           

Equities

   ¥ 21,283       ¥ —         ¥ —         ¥ 21,283   

Private equity investments

     —           —           7,510         7,510   

Japanese government securities

     61,803         —           —           61,803   

Bank and corporate debt securities

     2,380         2,163         —           4,543   

Investment trust funds and other(1)

     —           12,934         47,699         60,633   

Life insurance company general accounts

     —           52,109         —           52,109   

Other assets

     —           24,146         —           24,146   
  

 

 

    

 

 

    

 

 

    

 

 

 

Total

   ¥ 85,466       ¥ 91,352       ¥ 55,209       ¥ 232,027   
  

 

 

    

 

 

    

 

 

    

 

 

 

 

(1) Includes hedge funds and real estate funds.
Information about plan assets for which Level 3 inputs are utilized to determine fair value
     Millions of yen  
     Year ended March 31, 2015        
     Balance
as of
April 1,
2014
     Unrealized
and  realized
gains / loss
    Purchases /
sales and
other
settlement
    Balance
as of
March 31,
2015
 

Private equity investments

   ¥ 12,235       ¥  (2,147   ¥ (3,295   ¥ 6,793   

Investment trust funds and other

     11,820         3,936        32,789        48,545   
  

 

 

    

 

 

   

 

 

   

 

 

 

Total

   ¥ 24,055       ¥ 1,789      ¥   29,494      ¥ 55,338   
  

 

 

    

 

 

   

 

 

   

 

 

 
     Millions of yen  
     Year ended March 31, 2016        
     Balance
as of
April 1,
2015
     Unrealized
and  realized
gains / loss
    Purchases /
sales and
other
settlement
    Balance
as of
March 31,
2016
 

Private equity investments

   ¥ 6,793       ¥ (2,034   ¥ 2,751      ¥ 7,510   

Investment trust funds and other

     48,545         (2,018     1,172        47,699   
  

 

 

    

 

 

   

 

 

   

 

 

 

Total

   ¥ 55,338       ¥ (4,052   ¥  3,923      ¥ 55,209   
  

 

 

    

 

 

   

 

 

   

 

 

 
Expected benefit payments

Year ending March 31

   Millions of yen  

2017

   ¥ 15,150   

2018

     14,065   

2019

     14,173   

2020

     12,772   

2021

     11,995   

2022-2026

     60,576